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XCCDF
Guide to the Secure Configuration of Ubuntu 16.04
Services
SSH Server
Configure OpenSSH Server if Necessary
Set SSH Client Alive Count Max to zero
Set SSH Client Alive Count Max to zero
An XCCDF Rule
Details
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Set SSH Client Alive Count Max to zero
Medium Severity
The SSH server sends at most
ClientAliveCountMax
messages during a SSH session and waits for a response from the SSH client. The option
ClientAliveInterval
configures timeout after each
ClientAliveCountMax
message. If the SSH server does not receive a response from the client, then the connection is considered unresponsive and terminated. To ensure the SSH timeout occurs precisely when the
ClientAliveInterval
is set, set the
ClientAliveCountMax
to value of
0
in
/etc/ssh/sshd_config
: